| Model | SMG | SMG-a | SMG-b | SMG-c |
|---|---|---|---|---|
| Year | 1980 | 1985 | 1992 | 1993 |
| Driver type | 2-Way Quasi-Ribbon Planar-Magnetic midtreble : 58in² midbass : 370in | 2-Way Quasi-Ribbon Planar-Magnetic | 2-Way Quasi-Ribbon Planar-Magnetic | 2-Way Quasi-Ribbon Planar-Magnetic |
| Freq. Resp. | 50Hz-16kHz ±4dB | 50Hz-18kHz ±4dB | 50Hz-22kHz | 50Hz-26kHz |
| Crossover | 6dB/octave @ 2400Hz | ? | ? | ? |
| Power | 20-100W rms @ 😯 | 40-150W rms @ 😯 | 40-150W rms @ 😯 | 40-150W rms @ 😯 |
| Sensivity | 90dB/2.83v/m @ 500Hz | 90dB/2.83v/m @ 500Hz | 87dB/2.83v/m @ 500Hz | 86dB/2.83v/m @ 500Hz |
| Impedance | 4 Ohms | 4 Ohms | 4 Ohms | 4 Ohms |
| Dim. (W"×H"×D") | 24¼"×48½"×1¾" | 19" × 48" | 18½"×48"×1½" | 17"×48"×1½" |